66404646004 has 24 divisors (see below), whose sum is σ = 116954893440. Its totient is φ = 32989272576.

The previous prime is 66404646001. The next prime is 66404646017. The reversal of 66404646004 is 40064640466.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66404646001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 833269 + ... + 909475.

It is an arithmetic number, because the mean of its divisors is an integer number (4873120560).

Almost surely, 2^66404646004 is an apocalyptic number.

It is an amenable number.

66404646004 is a deficient number, since it is larger than the sum of its proper divisors (50550247436).

66404646004 is a wasteful number, since it uses less digits than its factorization.

66404646004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77607 (or 77605 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 66404646004 in words is "sixty-six billion, four hundred four million, six hundred forty-six thousand, four".